Take the Rocker cover off and spray strong carburetor cleaner on the offending valve stem, repeat several times. Then using a soft metal interface, tap on the valve stem to free it up.If it's truly stuck, it's going to take some physical force to un-stick it.

To help prevent the problem, run fuel cleaner such as Techron, etc in the gas.The problem comes from deposits from fuel on the valve stem as it moves out of the guide.

john ackley Wrote:-------------------------------------------------------> seafoam the shit out of it, then add a quart of> mystery oil to your gas and crank case. both will> do a little different thing, but your car will> love you for it